The change of wire tools tension has an influence on machining precision in machining hard and brittle materials,especially in the reversing and reciprocating process.Aiming at this problem,a novel tension precompensation control was proposed.Based on the self-developed multi-line cutting machine and tension system,the rule of tension change of guide wheel was analyzed.Then,the tension precompensation model was developed through the impact analysis of tension fluctuation on rotational displacements.Combined with the three-loop servo control structure,the tension precompensation controller was designed based on programmable motion controller.The impacts on tension fluctuation and velocity trajectory of proposed control scheme with tension precompensation and traditional servo PID control were compared and tested.The experimental results show that the proposed control scheme with tension precompensation has the advantages of low tension fluctuation and high movement stability.